Question from my side:
If you want to stay with one SSID (which is your choice, no comment there from me) you are aiming for 1 VLAN for everything Wifi and 1 VLAN (or multiple) for everything fixed ?
You should first clarify that part for yourself. Why VLAN ? To separate what from what and why ?
What is the list of the devices you want to have included in this setup ? I already see RB5009 (ROS) and CSS326 (SWOS), what else ? I THINK I notice a drawing for AC2 and/or AX2 ? It’s not clear from the picture.
Have a decent look at this EXCELLENT thread made by pcunite, it contains all basics needed to get you started.
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Read it more then once (it’s needed, trust me).
Once you see the pieces falling together, it’s not thát difficult if you follow the steps.
It helps if you can use spare material to build small setups to test things in order to get everything digested.